Apparatus for the manufacture of hollow bodies from fibrous pulp



May a, 1927. y 1,626,847

RrLECHTHALER APPARATUS FOR THE MANUFACTURE OF HOLLOW aovxss FROM FIBROUSPULP Filed feb. 12, 1925 if aoi l il. f

. i l l l l l i l Lwviyvroa. R LechhaIer BY WMMCM ATTORNEYS.

Patented May 3,- 1927. i

UNITED STATES A 1,626,847 PATENT oFFlca,

ROBERT LECHTHALEB, OF BERLIN-CHARLOTTENBUBG, GERMANY, ..AS8IGNOB TOBAUMGKRTNER, DB. KATZ & 00., G. -M'. B. 11., OF SPANDAU-EISWEBDEB,GERMANY,

a conrona'rron or onmramr.

arranacrus non zrnn nanurac'runn or HOLLOW nomns anon rxnnous PULP.

Application filed February 12, 1925, Serial no. asst, and in GermanyFebruary 12; 1924.

'lhisinvention relates to an a paratus for 15 art has not ervious walls.Thisisefiected or instance y an impervious metal sheet being fixed atthe .top and b placln it around the pervious wall also or provi ing themeans for guiding the pressure medium.

- This also provides a firm supporting surface for the headof the mould.A constructional example of the invention 1s shown diagrammatlc'ally inthe drawin in section.

The pressure medium asses t rou h the 26 supply pipe a (Fig. 1) a e'rflowing t ough the head d of the mould into the interlor of the mould c.The upper end of the mould is made impervious to air, for'instance bythe rovision of a solid sheet of so metal 6. The ower part of the mouldc is pervious, including the lower end of the mould. The lower ed eofthe head 11 of the mould rests on t eimpervious sheet metal ,part b.

.The iapparatus o erateg nin the following manner:-In the rst p headpart (I resting firmly on the, 'part b, the pressure medium is reventedfromblowing through at an un esirable place. YThe 40 arrangement alsoprevents the pressure medium from striking too strongly against the u erart of-the rvious part of the, -m b iild The pressu i'z medium willfirst.

while at full pressure sweep along the impervious sheet metal or otherimperviousupper surface of the mould and will then pass alon the sidewalls ofthemould a downwar direction By changing the, 1mpervious orsheet metal part 1t is posslble to mould vessels of difierent height 1nthe same mould without the necessity of introducing the head of themould further into the mould or keeping a stock of moulds for each sizeof vessel. I Finally, low vessels -medium on the material is weaker;

ce, through the (for instance the lids oi boxes) can be made with asatisfactory .end, as through the greater distance between the entranceof the pressure medium and the end of the vessel to he moulded, theimpact ofthe pressure In a further modification of the invention 15shown also in-section. ,In this case an inserted part e of pervioussheet metal is 7 provided, which is fixed to an auxiliary frame 7',which is located behind the frame g of the mould, so that the insertedperforated metal sheets will have the desired position with respect toone another at the lace at which the rebate or the main part of thearticle is to be produced. The said auxiliary frame is removable and canbe placed where the article to be moulded is tohave the rebate. Thuswith a single mould hollow bodies ma be made having a rebate ofdifferent length at different positions. With the new apparatus it isfor instance possible to mould a vessel together with. the corres ondingcover. This is efiected by first mou ding .the vessel, an im rviousmetal sheet of the shape shown in Fig. 2 being used. The inserted part 6will in this case be placed immediately below the impervious part b, sothat the rebate'is'formed' at the top. If the corresponding cover is tobe made in the same mould, it is of course imperative that the covershould fit the vessel for the cover. On the'cover bein made byintroducing the fibrous pulp and t e gaseous pressure medlum, the coverwill fit exactly on to the previously made vessel.

Having now particularly described and ascertame the nature of my saidinvention and in what manner the same is to beperformed, I declare thatwhat I claim is 1. An apparatus for the production of hollow bod1es fromfibrous pulp by means of aheated gaseous medium underpressure,comprising a stationary mould capable of being taken apart havingpervious walls and of ater eight than the article to be mdulded' tereinas set/forth.

2. An apparatus for the production ,of hollow bodies from' fibrous pulpby means of .a heated gaseous medium under pressure, 001m prising amould stationary during the moulding and capable of being taken apart,having pervious walls and of greater height than the article to bemoulded therein, and a removable member having impervious walls,saidmember being intended to extend down to the upper edge of the article tobe moulded, as set forth.

3. An apparatus for the production of hollow bodies from fibrous pulp bymeans of a heated gaseous medium under ressure, comprising a mouldstationary during the mouldmg and capable of being taken. apart, havingimpervious walls overhanging inwardly at the topl and being intended toextend" down to t e upperedge of the article tobe moulded, me us forintroducing the fibrous pulp into the mould, a connecting member forconnecting said means to the said removable member, said pressure memberbeing intended to rest on the upper edge of the removable member so asto form a pressure tiglit joint therewith, as set forth.

' 4.. An apparatus for the production of hollow bodies from fibrous pulpby means of a heated gaseous medium under pressure, comprising a mouldstationary I during the moulding and havin a pervious part and apervious member intended to be placed uponsaid pervious part,'whereby arebate can be formed on the article tobe moulded and articles ofdifferent height may be made in the same mouldfas set forth.

In testimony whereof I have signed myname to this specification.

ROBERT LECHTHALER.

